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Description: The theta function is lower bounded by a linear term. Corollary of chebbnd1 . (Contributed by Mario Carneiro, 8-Apr-2016)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | chto1lb | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ovexd | ⊢ ( ⊤ → ( 2 [,) +∞ ) ∈ V ) | |
| 2 | 2re | ⊢ 2 ∈ ℝ | |
| 3 | elicopnf | ⊢ ( 2 ∈ ℝ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↔ ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) ) ) | |
| 4 | 2 3 | ax-mp | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↔ ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) ) |
| 5 | 4 | biimpi | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) ) |
| 6 | 5 | simpld | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 𝑥 ∈ ℝ ) |
| 7 | 0red | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 ∈ ℝ ) | |
| 8 | 2 | a1i | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 2 ∈ ℝ ) |
| 9 | 2pos | ⊢ 0 < 2 | |
| 10 | 9 | a1i | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 < 2 ) |
| 11 | 5 | simprd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 2 ≤ 𝑥 ) |
| 12 | 7 8 6 10 11 | ltletrd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 < 𝑥 ) |
| 13 | 6 12 | elrpd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 𝑥 ∈ ℝ+ ) |
| 14 | ppinncl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) → ( π ‘ 𝑥 ) ∈ ℕ ) | |
| 15 | 14 | nnrpd | ⊢ ( ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) → ( π ‘ 𝑥 ) ∈ ℝ+ ) |
| 16 | 5 15 | syl | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( π ‘ 𝑥 ) ∈ ℝ+ ) |
| 17 | 1red | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 1 ∈ ℝ ) | |
| 18 | 1lt2 | ⊢ 1 < 2 | |
| 19 | 18 | a1i | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 1 < 2 ) |
| 20 | 17 8 6 19 11 | ltletrd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 1 < 𝑥 ) |
| 21 | 6 20 | rplogcld | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( log ‘ 𝑥 ) ∈ ℝ+ ) |
| 22 | 16 21 | rpmulcld | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ∈ ℝ+ ) |
| 23 | 13 22 | rpdivcld | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ∈ ℝ+ ) |
| 24 | 23 | rpcnd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ∈ ℂ ) |
| 25 | 24 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ∈ ℂ ) |
| 26 | chtrpcl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) → ( θ ‘ 𝑥 ) ∈ ℝ+ ) | |
| 27 | 5 26 | syl | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( θ ‘ 𝑥 ) ∈ ℝ+ ) |
| 28 | 22 27 | rpdivcld | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ∈ ℝ+ ) |
| 29 | 28 | rpcnd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ∈ ℂ ) |
| 30 | 29 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ∈ ℂ ) |
| 31 | 6 | recnd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 𝑥 ∈ ℂ ) |
| 32 | 21 | rpcnd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( log ‘ 𝑥 ) ∈ ℂ ) |
| 33 | 16 | rpcnd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( π ‘ 𝑥 ) ∈ ℂ ) |
| 34 | 21 | rpne0d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( log ‘ 𝑥 ) ≠ 0 ) |
| 35 | 16 | rpne0d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( π ‘ 𝑥 ) ≠ 0 ) |
| 36 | 31 32 33 34 35 | divdiv1d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) = ( 𝑥 / ( ( log ‘ 𝑥 ) · ( π ‘ 𝑥 ) ) ) ) |
| 37 | 32 33 | mulcomd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( log ‘ 𝑥 ) · ( π ‘ 𝑥 ) ) = ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) |
| 38 | 37 | oveq2d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( 𝑥 / ( ( log ‘ 𝑥 ) · ( π ‘ 𝑥 ) ) ) = ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) |
| 39 | 36 38 | eqtrd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) = ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) |
| 40 | 39 | mpteq2ia | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) |
| 41 | 40 | a1i | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) |
| 42 | 27 | rpcnd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( θ ‘ 𝑥 ) ∈ ℂ ) |
| 43 | 22 | rpcnd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ∈ ℂ ) |
| 44 | 27 | rpne0d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( θ ‘ 𝑥 ) ≠ 0 ) |
| 45 | 22 | rpne0d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ≠ 0 ) |
| 46 | 42 43 44 45 | recdivd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) = ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) |
| 47 | 46 | mpteq2ia | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) |
| 48 | 47 | a1i | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 49 | 1 25 30 41 48 | offval2 | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) · ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) ) |
| 50 | 31 43 42 45 44 | dmdcan2d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) · ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) = ( 𝑥 / ( θ ‘ 𝑥 ) ) ) |
| 51 | 50 | mpteq2ia | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) · ( ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) |
| 52 | 49 51 | eqtrdi | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ) |
| 53 | chebbnd1 | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) ∈ 𝑂(1) | |
| 54 | ax-1cn | ⊢ 1 ∈ ℂ | |
| 55 | 54 | a1i | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 1 ∈ ℂ ) |
| 56 | 27 22 | rpdivcld | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ∈ ℝ+ ) |
| 57 | 56 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ∈ ℝ+ ) |
| 58 | 57 | rpcnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ∈ ℂ ) |
| 59 | 6 | ssriv | ⊢ ( 2 [,) +∞ ) ⊆ ℝ |
| 60 | rlimconst | ⊢ ( ( ( 2 [,) +∞ ) ⊆ ℝ ∧ 1 ∈ ℂ ) → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ 1 ) ⇝𝑟 1 ) | |
| 61 | 59 54 60 | mp2an | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ 1 ) ⇝𝑟 1 |
| 62 | 61 | a1i | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ 1 ) ⇝𝑟 1 ) |
| 63 | chtppilim | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ⇝𝑟 1 | |
| 64 | 63 | a1i | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ⇝𝑟 1 ) |
| 65 | ax-1ne0 | ⊢ 1 ≠ 0 | |
| 66 | 65 | a1i | ⊢ ( ⊤ → 1 ≠ 0 ) |
| 67 | 56 | rpne0d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ≠ 0 ) |
| 68 | 67 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ≠ 0 ) |
| 69 | 55 58 62 64 66 68 | rlimdiv | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ⇝𝑟 ( 1 / 1 ) ) |
| 70 | rlimo1 | ⊢ ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ⇝𝑟 ( 1 / 1 ) → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ∈ 𝑂(1) ) | |
| 71 | 69 70 | syl | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ∈ 𝑂(1) ) |
| 72 | o1mul | ⊢ ( ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) ∈ 𝑂(1) ∧ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ∈ 𝑂(1) ) → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ) ∈ 𝑂(1) ) | |
| 73 | 53 71 72 | sylancr | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( log ‘ 𝑥 ) ) / ( π ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 / ( ( θ ‘ 𝑥 ) / ( ( π ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) ) ) ∈ 𝑂(1) ) |
| 74 | 52 73 | eqeltrrd | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) ) |
| 75 | 74 | mptru | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) |